論文

国際誌
2022年3月25日

Two Japanese patients with Noonan syndrome-like disorder with loose anagen hair 2.

American journal of medical genetics. Part A
  • Kaori Maruwaka
  • ,
  • Yoko Nakajima
  • ,
  • Takaharu Yamada
  • ,
  • Taihei Tanaka
  • ,
  • Rika Kosaki
  • ,
  • Hidehito Inagaki
  • ,
  • Kenjiro Kosaki
  • ,
  • Hiroki Kurahashi

記述言語
英語
掲載種別
DOI
10.1002/ajmg.a.62733

Noonan syndrome-like disorder with loose anagen hair (NSLH) is a rare disease characterized by typical features of Noonan syndrome with additional findings of relative or absolute macrocephaly, loose anagen hair, and a higher incidence of intellectual disability. NSLH1 is caused by a heterozygous mutation in the SHOC2 gene on chromosome 10q25, and NLSH2 is caused by a heterozygous mutation in the Protein phosphatase one catalytic subunit beta (PPP1CB) gene on chromosome 2p23. Protein phosphatase1 (PP1), encoded by PPP1CB, forms a complex with SHOC2 and dephosphorylates RAFs, which results in activation of the signaling cascade and contribution to Noonan syndrome pathogenesis. Here, we report two genetically confirmed Japanese patients with NSLH2 having the same de novo mutation in PPP1CB presenting prominent-hyperteloric-appearing eyes and a tall forehead similar to individuals carrying a mutation in PPP1CB, c.146C > G; p.Pro49Arg, which is different from typical facial features of Noonan syndrome. They also showed short stature, absolute macrocephaly, and loose anagen hair like NSLH1: however, growth hormone deficiency often seen in NSLH1 caused by SHOC2 mutation was absent. Although a number of Noonan syndrome and NSLH1 patients have shown blunted or no response to GH therapy, linear growth was promoted by recombinant human growth hormone (rhGH) in one of our patients. Since another NSLH2 patient with good response to rhGH treatment was reported, rhGH therapy may be effective in patients with NSLH2.

リンク情報
DOI
https://doi.org/10.1002/ajmg.a.62733
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/35338599
ID情報
  • DOI : 10.1002/ajmg.a.62733
  • PubMed ID : 35338599

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